Using the law of superposition and the principle of cross-cutting relationships, which of the layers of rock in this image is younger than layer C and closest in age to layer C? A: Layer A
B: Layer E
C: Layer D
D: Layer B

D. Layer B

Explanation:

The correct answer is Layer B.

The law of superposition actually states that the sedimentary rock unit is at the bottom while the the youngest rock is at the top.  The principle of cross-cutting relationships states in layers of rocks, a fault or intrusion that cuts through rock layers is younger than the rocks that it cuts through.

Layer B was actually formed after Layer C. This makes Layer B younger than Layer C and closest in age to Layer C. The intrusion, Layer D is the youngest of all.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?